Sentence Correction

Nikola Tesla, the inventor of alternating current, because he was excited with the prospects of harnessing Niagara Falls for producing electric power, he predicted in the mid-1890's that electricity generated at Niagara would one day power the streetcars of London and the streetlights of Paris.

(A) Nikola Tesla, the inventor of alternating current, because he was excited with the prospects of harnessing Niagara Falls for producing electric power, he
(B) The prospects of harnessing Niagara Falls to produce electric power was exciting to Nikola Tesla, the inventor of alternating current, and so he
(C) Excited about the prospects of harnessing Niagara Falls to produce electric power, Nikola Tesla, the inventor of alternating current,
(D) Nikola Tesla, the inventor of alternating current, excited about the prospects of harnessing Niagara Falls for the production of electric power and
(E) The inventor of alternating current, excited with the prospects of harnessing Niagara Falls for producing of electric power, Nikola Tesla

[spoiler]OA: C[/spoiler]
Though B could be eliminated for subject - Verb agreement 'prospects -was'
B: Would like to know if ', and so he' is fine or Incorrect
The prospects of harnessing Niagara Falls to produce electric power was exciting to Nikola Tesla, the inventor of alternating current, and so he predicted in the mid-1890's that electricity generated at Niagara would one day power the streetcars of London and the streetlights of Paris.

Nikola Tesla, the inventor of alternating current, because he was excited with the prospects of harnessing Niagara Falls for producing electric power, he predicted in the mid-1890's that electricity generated at Niagara would one day power the streetcars of London and the streetlights of Paris.

(A) Nikola Tesla, the inventor of alternating current, because he was excited with the prospects of harnessing Niagara Falls for producing electric power, he
(B) The prospects of harnessing Niagara Falls to produce electric power was exciting to Nikola Tesla, the inventor of alternating current, and so he
(C) Excited about the prospects of harnessing Niagara Falls to produce electric power, Nikola Tesla, the inventor of alternating current,
(D) Nikola Tesla, the inventor of alternating current, excited about the prospects of harnessing Niagara Falls for the production of electric power and
(E) The inventor of alternating current, excited with the prospects of harnessing Niagara Falls for producing of electric power, Nikola Tesla

IMO: C

But why is ', and so he' Incorrect

abcgmat wrote:But why is ', and so he' Incorrect

B - the sentence makes 'the prospects of harnessing Niagara Falls' as the main subject and Nikola Tela as the object. 'and so he' makes it a dependent clause modifying the direct object of the sentence.

We are looking for a sentence where 'predicted in the mid-1890's ..' is part of the main clause. So C is right choice making it short and concise. Eliminating the Opening modifier and non essential modifiers, Nikola tesla becomes the main subject and 'that electricity generated ...' becomes the main object of the sentence.

Does it mean subject pronoun refers only to subject and
object pronoun refers only to object

can we say it is wrong otherwise 100% of the time
when object pronoun refers to subject or subject pronoun refers to object -It is always incorrect

abcgmat wrote:Does it mean subject pronoun refers only to subject and
object pronoun refers only to object

can we say it is wrong otherwise 100% of the time
when object pronoun refers to subject or subject pronoun refers to object -It is always incorrect

I don't get your query, by the way I never mentioned anything about pronouns.

The prospects of harnessing Niagara Falls to produce electric power were exciting to Nikola Tesla, the inventor of alternating current, and so he predicted in the mid-1890's that electricity generated at Niagara would one day power the streetcars of London and the streetlights of Paris. - This is grammatically right, but doesn't give us the right meaning as I said in the above explanation.

sam2304 wrote:

abcgmat wrote:But why is ', and so he' Incorrect

B - the sentence makes 'the prospects of harnessing Niagara Falls' as the main subject and Nikola Tela as the object. 'and so he' makes it a dependent clause modifying the direct object of the sentence.
.

-- I understood that ',and so he....' is a dependent clause.
I also understood that 'he' refers to object Nikola Tela
[So i assumed you meant to say that: he(subject pronoun) is referring to object which it should not]
--I now get thats not what you meant

you said: 'We are looking for a sentence where 'predicted in the mid-1890's ..' is part of the main clause'
But why do you want to make the above as part of main clause. What is wrong if its dependent clause
it still makes sense. correct me If I am wrong

abcgmat wrote: -- I understood that ',and so he....' is a dependent clause.
I also understood that 'he' refers to object Nikola Tela
[So i assumed you meant to say that: he(subject pronoun) is referring to object which it should not]
--I now get thats not what you meant

so far so good I thought I did a pathetic job in explaining what I wanted to say.

you said: 'We are looking for a sentence where 'predicted in the mid-1890's ..' is part of the main clause'
But why do you want to make the above as part of main clause. What is wrong if its dependent clause
it still makes sense. correct me If I am wrong

This is not about whether the sentence makes sense or not. Its about conveying the facts in the most precise and understandable form. GMAT prefers concision. What you wanted to convey should be the main clause and whatever that are unnecessary should come as a dependent clause. So its like reading the main point of a sentence. If we remove the sub ordinate clauses, modifiers - non essential ones we should get what is being conveyed. See how it works in B and C.

B - The prospects of harnessing Niagara Falls to produce electric power were exciting to Nikola Tesla [spoiler], the inventor of alternating current, and so he predicted in the mid-1890's that electricity generated at Niagara would one day power the streetcars of London and the streetlights of Paris. [/spoiler] - Removing the modifiers and the sub ordinate clauses, we don't get the necessary meaning as in this is not we wanted to know from this sentence.

C - Excited about the prospects of harnessing Niagara Falls to produce electric power, Nikola Tesla, the inventor of alternating current, predicted in the mid-1890's that electricity generated at Niagara would one day power the streetcars of London and the streetlights of Paris. - Compared to B, this is better, short and very clear in conveying by giving importance to what is necessary.

GMAT SCs always try to make the main clauses shorter so that the intended meaning is clear by moving out unnecessary details as modifiers or as sub ordinate clauses. - This is completely my opinion but I have observed this in most of the sentences.

Sam2304, many thanks

I think the use of 'and' also require parallelism

The prospects of harnessing Niagara Falls to produce electric power were exciting to Nikola Tesla , the inventor of alternating current, and so he predicted in the mid-1890's that electricity generated at Niagara would one day power the streetcars of London and the streetlights of Paris.

prospects of harnessing Niagara is not so much parallel to he

Hi Experts ,

Can you please advise that in option A , why COMMA + HE is wrong ?

Please advise.

Thanks